Effects of Soy Isoflavone Consumption

Thirty-five healthy men [avg 23-33yrs of age] consumed milk protein isolate, low isoflavone soy protein isolate-1.6 +/- 0.19 mg isoflavones/day and high isolflavone soy protein isolate at 61.7 +/- 7.4mg isoflavones/day for 57 days. Each separated by 4 week washout periods, in a randomized crossover design. Conclusions: Soy protein , regardless of isoflavone content, decreased serum DHT and DHT/testosterone with minimal effects on other androgens, estrogens, gonadotropins, or SHBG in healthy young men. In lamen terms; over the course of the study, soy consumption decreased DHT, the derivative that is associated with benign prostastic hyperplasia aka prostate enlargement, as well as baldness, but did not 'quite' affect other forms of testosterone.

References;
Macrobolic Nutrition by, Gerard Dente and Kevin Hopins, Copy Right 2004.

B.L Dillingham, B.L McVeigh, J.W Lampe, and A.M Duncan "Effects of Soy Isoflavone Consumption on Reproductive Hormones in Healthy Young Men" Department of Human biology and Nutritional Sciences, University of Guelph, Ontario, Canada and the Fred Hutchinson Cancer Research Center, Seattle, Washington, USA.